can't see usb hard drives

[Douglas Pollard]

I have 4 hard drive 2 of them are external usb drives first is   sda 1, 
2, and 5  ext 3 the second drive is sdb1 and has a single partition 
ext3  the 3rd drive is a USB   sdc1 single partition ext3 . This next 
drive is odd it is also USB  sdh 1 ext3 . Computer file browser cannot 
see the USB drives.   The last tree drives were formatted and 
partitioned in Gparted.  Gparted can't see USB  sdh 1 now.
    I Did fdisk -l  and received below info
    Hope someone can help me with this I'm getting dog gone close to 
doing video with this system.  Pretty Exciting :-)
                                                    Doug



Disk /dev/sda: 200.0 GB, 200049647616 bytes
255 heads, 63 sectors/track, 24321 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x028ef790

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1       23993   192723741   83  Linux
/dev/sda2           23994       24321     2634660    5  Extended
/dev/sda5           23994       24321     2634628+  82  Linux swap / Solaris

Disk /dev/sdb: 250.0 GB, 250059350016 bytes
255 heads, 63 sectors/track, 30401 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x09a43bda

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1               1       30401   244196001   83  Linux

Disk /dev/sdc: 160.0 GB, 160041885696 bytes
255 heads, 63 sectors/track, 19457 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x0009e195

   Device Boot      Start         End      Blocks   Id  System
/dev/sdc1               1       19457   156288321   83  Linux

Disk /dev/sdh: 250.0 GB, 250059349504 bytes
255 heads, 63 sectors/track, 30401 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x32ab94cc

   Device Boot      Start         End      Blocks   Id  System
/dev/sdh1               1       30401   244196001   83  Linux